The next step is to find the right program at a drug and alcohol treatment center for you. At Banyan Chicago, we understand that this process is difficult and often overwhelming. What do all of those letters stand for? What is the difference between PHP and IOP? Which program will work best? Because we offer both PHP and IOP services at our treatment centers in Illinois, our team is here to explain the difference between the two and help you get a better idea of which program will be the most successful for your or your loved one.